[Nakes]

I have always found the spray on variety of nikwax far more effective than the wash-in, you may want to consider that as the repellency will wear off fairly quickly under regular use. I mostly use it for gore-tex gear, but it was also fairly effective when I used it on my windpro fleeces. Don't expect it to keep you dry if your garment isn't already waterproof though, it's not some magical waterproofer, it's just going to cause the water to bead more so it falls off rather than soaks in. Under anything more than a light shower, you're going to get wet.

Phil, if water is getting in your gore-tex garment then it is damaged or not goretex at all. Even without DWR treatment NO water should get through at all, the fabric is still completely waterproof but if the face layer gets wet, it will not breath at all.